CN100467934C - Reduction of cryogen loss during transportation of cryostats - Google Patents
Reduction of cryogen loss during transportation of cryostats Download PDFInfo
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- CN100467934C CN100467934C CN 200580024597 CN200580024597A CN100467934C CN 100467934 C CN100467934 C CN 100467934C CN 200580024597 CN200580024597 CN 200580024597 CN 200580024597 A CN200580024597 A CN 200580024597A CN 100467934 C CN100467934 C CN 100467934C
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- 239000002826 coolant Substances 0.000 claims description 38
- 238000001816 cooling Methods 0.000 claims description 25
- 238000004804 winding Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 37
- 239000000659 freezing mixture Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 11
- 238000001704 evaporation Methods 0.000 description 5
- 238000002595 magnetic resonance imaging Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 235000019628 coolness Nutrition 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/005—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour the refrigerant being a liquefied gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/006—Thermal coupling structure or interface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/05—Applications for industrial use
- F17C2270/0527—Superconductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/002—Arrangements provided on the transformer facilitating its transport
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Power Engineering (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
In order to minimize the loss of cryogen during transportation of superconductive magnet systems, or indeed at any time that the refrigerator is turned off, part of the boil-off gas is directed from the cryogen vessel through the refrigerator interface and past the refrigerator to cool the refrigerator. Some of the heat conducted along the refrigerator into the system is intercepted and removed by that part of the boil-off gas. The heat load onto the cryogenic vessel is thereby reduced, which in turn reduces the boil-off of cryogen from the cryogenic vessel. This part of the boil-off gas is then vented from the system along with the remainder of the boil-off gas, for example to leave the cryogenic liquid vessel via the access neck.
Description
The superconduction magnetic system is used for media coherence disturbance, for example, is used in nuclear magnetic resonance imaging system.The requirement of MRI magnet is that it produces stable, uniform magnetic field.In order to realize required stability, it is common using the superconduction magnetic system of operating under ultralow temperature.Usually keep temperature by being immersed in the cryogen (for example liquid helium) superconductor cooled off.
The superconduction magnetic system generally includes one group of superconduction winding that is used to produce magnetic field, and it is immersed in holding the cryogen container of this superconduction winding in the cryogen so that winding is remained under the superconducting temperature.The cryogen container is surrounded by the vacuum envelope of one or more thermoscreens and this shielding of complete closed and low-temperature (low temperature) vessel usually.
The visit neck enters the low-temperature (low temperature) vessel by vacuum envelope from the outside usually.This visit neck is used for cryogenic liquide filling low-temperature (low temperature) vessel and is used for safeguarding in low-temperature (low temperature) vessel to guarantee the normal running of magnet system.
Cryogen, particularly helium are expensive and wish that design in some way and actuating solenoid system are so that reduce to minimum with the cryogenic liquide amount that is consumed.The evaporation that cryogenic liquide can be caused by the heat leak that enters in the low-temperature (low temperature) vessel and losing.Vacuum envelope reduces the heat that leaks into low-temperature (low temperature) vessel by conduction and convection current.Thermoscreen reduces by the heat of radiation leakage to low-temperature (low temperature) vessel.In order further to reduce thermal load-leak into the heat of cryogen container, and therefore reduce the liquid loss, using refrigerator that thermoscreen is cooled to low temperature is common practical methods.Thereby the consumption of using the direct freezing coolant container of this refrigerator to reduce cryogenic fluid also is known.Wherein use the first order to come heat of cooling shielding and to cool off the two stage cooler of low-temperature (low temperature) vessel also be known in the second level.
Wish that this superconduction magnetic system that will comprise cooling liquid is transported to operatively from the manufactured place, so that they can be operated as quickly as possible.During transportation, the refrigerator that cools off one or more shieldings and/or coolant container is idle, and can not be from the load of coolant container heat of transport.Certainly, refrigerator self provides the low thermal resistive path that arrives low-temperature (low temperature) vessel to external heat.This then mean evaporation level high relatively in transportation process, cause the loss of coolant liquid.Under such environment, the freezing mixture of evaporation is discharged into atmosphere usually.Because freezing mixture is expensive and in order to prolong time of can be used for sending (system can keep together with the refrigerator of not operation but still comprise time of some coolant liquids), the loss of freezing mixture is reduced to possible minimum value wish.
In the structure formerly, leave coolant container through the visit neck separately from the coolant liquid vaporized gas.As everyone knows, cool off the visit neck of coolant container and provide cooling for thermoscreen, can adopt cold air to reduce the heat that is input to coolant container from the cryogenic liquide that seethes with excitement by carrying out heat exchange with cold type gas by the cooling power of using gases.
When transporting the refrigerator of closing the superconduction magnetic system, external heat is transmitted to thermoscreen and/or coolant container along passive refrigerator.Refrigerator is detachably connected to thermoscreen and low-temperature (low temperature) vessel by the refrigerator interface usually.Verified, refrigerator is removed the thermal load that can reduce internal system significantly from the refrigerator interface, thus and the loss of minimizing cryogenic liquide.Yet the shortcoming of this solution is more than its advantage: when the MRI system enters operation, refrigerator must be reduced, and keep this in the back operation as far as possible simply wish.The refrigerator reduction may be related to difficulty and skilled operation.It also need be after magnet system be in place, and even before system assembles fully, allow refrigerator to operate as quickly as possible, to prevent the further loss of freezing mixture.
Therefore the present invention solves the not problem of the coolant loss of the superconduction magnetic system of operation, and the refrigerator that especially solves not operation is presented on the problem of the thermal load that causes the cryogenic liquide loss on the magnetic system.
Thereby, the invention provides the method and apparatus that limits as accessory claim.
According to an aspect of the present invention, for in the transportation process of superconduction magnetic system, perhaps in addition refrigerator close whenever with the minimization of loss of freezing mixture, the part boil-off gas is orientated from coolant container through the refrigerator surface and by refrigerator with the cooling refrigeration machine.Being transmitted to intrasystem some heat along refrigerator is tackled and removes by the part boil-off gas.Reduce the thermal load on the low-temperature (low temperature) vessel thus, this then reduced the evaporation of the freezing mixture of low-temperature (low temperature) vessel.This part boil-off gas is discharged from system together with the remainder of boil-off gas subsequently, for example leaves cryogenic liquid vessel via the visit neck.
Be described addressing further purpose, characteristic and advantage on of the present invention in conjunction with the accompanying drawings and with reference to as an example a plurality of specific embodiments only, wherein:
Fig. 1 has shown the cross section that is used for the superconduction magnetic system of MRI system according to one embodiment of the invention;
Fig. 2 has shown the cross section of the superconduction magnetic system of partial graph 1 in further detail;
Fig. 3 has shown the specific detail of the embodiment of the invention shown in Figure 2;
Fig. 4 has shown the view corresponding with Fig. 3 according to another embodiment of the present invention; And
Fig. 5 has shown the embodiments of the invention that are suitable for shielding cooling.
Fig. 1 has shown the cross section that is used for the superconduction magnetic system 3 of MRI system according to one embodiment of the invention.Secondary Cryo Refrigerator 1 removably connects by interface sleeve pipe (being also referred to as the interface sleeve) 2, so that its first order cooling shielding 20 and its second level cooling low-temperature (low temperature) vessel 5.The refrigerator preferred disposition is the refrigerator that condenses again.Be exposed to the inside of low-temperature (low temperature) vessel 5 by the heat exchanger of the second level of refrigerator cooling, for example by pipe 4.Therefore when operation, refrigerator can reduce consumption of cryogenic liquide by its liquid state of condensing back again of the freezing mixture that will evaporate.
Superconducting magnet coil (figure does not show) is arranged in the low-temperature (low temperature) vessel 5.The interface sleeve pipe is that the outside from cryostat 3 extends to and coolant container 5 hot linked chambers.In certain embodiments, the inside of coolant container can be exposed to the inside of sleeve pipe.Sleeve pipe preferably is made up of the thin-walled of relative low heat conductivity material, for example the stainless steel of specific grade.Coil is immersed in the cryogenic liquide 5a.Thermoscreen 20 is provided around low-temperature (low temperature) vessel.Vacuum envelope 22 seals low-temperature (low temperature) vessel and shielding in a vacuum.Mesopore 24 is provided checks so that hold the patient.Provide visit neck 7 to allow visit low-temperature (low temperature) vessel 5.
According to one embodiment of the invention, pipeline 6 provides from the top of interface sleeve pipe 2 to the gas conduit at visit neck 7 tops.From the boil-off gas of freezing mixture 5a can from coolant container 5 through manage 4, interface sleeve pipe 2 and flow to visit neck 7 along pipeline 6.
The advantage that existence provided of pipeline 6 is, in transportation process, upwards transmits through interface sleeve pipe 2 from a part of boil-off gas of the freezing mixture of boiling, by refrigerator 1.Cooled off refrigerator 1 like this and reduced and conducted to external heat in the superconduction magnetic system by the refrigerator 1 of not operation.Preferably, when the superconduction magnetic system was operated, pipeline 6 was closed by one or more valves.
Fig. 2 has shown the more detailed schematic representation of refrigerator interface sleeve pipe 2 and pipeline 6.In transportation process, and even whenever do not operate at refrigerator 1, the evaporant of freezing mixture 5a will occur, and boil-off gas will produce under the temperature a little more than the boiling point of freezing mixture.Liquid helium generally is used in many superconduction magnetic systems.In this system, the temperature of boil-off gas is in the 4K scope.Refrigerator 1 will be exposed to the external temperature of about 300K.Because refrigerator 1 is not operated, and will set up temperature gradient along the length of refrigerator.It is linear that main purpose of the present invention is to adjust temperature gradient.
The boil-off gas that in low-temperature (low temperature) vessel 5, produces can by visit neck 7 or according to a further aspect in the invention through manage 4, interface sleeve pipe 2, by refrigerator and with after pipeline 6 leaves container.These two route optimizations just converge in the upstream of outlet valve 26 (Fig. 1).The boil-off gas of refrigerator of flowing through at first enters in the space 8 between the bottom of the refrigerator second level and interface sleeve pipe, enters then in the space 9 between the top of the refrigerator first order and interface sleeve pipe.In order to advance between the bottom of boundary's sleeve pipe and top, gas must cross the hot connecting 15,30 of refrigerator first order hot link to thermoscreen 20.To further describe this structure with reference to figure 3 hereinafter.Boil-off gas flows in the connecting tube 10 attached to the upper flange 11 of refrigerator subsequently, and then in the flow ipe 6.Pipeline 6 is preferably with valve 12 and cooperates, and valve 12 is opened in transportation process, but closes in the course of normal operation of the magnetic system when refrigerator is operated.In addition, pipeline 6 can cooperate with means 13 with the air-flow of control by refrigerator, and means 13 can realize easily by using the throttle orifice that is fit to size.Throttle orifice can be a fixed dimension or adjustable.
Fig. 3 shown in the sleeve pipe of interface, especially the further details of the refrigerator of the refrigerator first order in the hot connecting 15,30 of shielding 20.In this example, first order heat exchanger 28 and contact flange 15 thereof be attached to hot connecting between shielding 20 the thermal contact 30 by using compacting taper realization, though can alternative employing other means well known in the art.Hot connecting can adopt indium metal to improve the thermo-contact between contact flange 15 and the thermal contact 30.
As mentioned above, flow through sleeve pipe 2 bottoms, the partial boil-off gas by refrigerator must be crossed the hot connecting 15,30 of refrigerator first order hot link to thermoscreen 20.Fig. 3 has shown and has been used for the certain candidate configuration that boil-off gas passes hot linked path.
Boil-off gas can via provide by or pass hot connecting through the passage of path of contact flange 15.In an embodiment shown in Figure 3, passage 14 is cut into the outer contacting face of contact flange.In another embodiment, passage 16a is cut into the internal surface that contacts flange and is cut into the upper surface that contacts flange the radial passage 16 that connects.On the master map of Fig. 3, passage 14 is shown as the appropriate location at right-hand side, and passage 16,16a are shown as the appropriate location of side leftward.In another alternative, slope hole 17 can be holed or other modes form and run through contact flange 15, to be provided for the path that gas flows between casing running part 8 and last sleeve portion 9.Though alternative 14,16 and 16a are easier to make, their shortcoming is that area of contact and the area of contact between contact flange and thermal contact 30 between refrigerator first order heat exchanger and contact flange reduces respectively.Slope hole 17 does not have this shortcoming, but difficult the manufacturing.Utilize any one among these embodiments, pass or pass through the boil-off gas and the flange of contact flange 15, and therefore be in good thermo-contact with thermal contact 30, and help by the hot linked thermoscreen of first cooling class of hot connecting 19 coolings with refrigerator, hot connecting 19 can be any suitable known forms, for example flexible copper threading.
In alternative, for example with 14,16,16a and 17 paths that show can alternatively or be additionally provided in the thermal contact 30, rather than only be arranged in the contact flange 15.
Along with boil-off gas flows through refrigerator, be initially under the temperature of about 4K, refrigerator is cooled off.The heat that is removed by boil-off gas is upward through sleeve pipe along with gas and it is heated.Although boil-off gas is heated, it remains under the low-down temperature.Thereby in its process or in by the process that contacts flange 15 and/or hot interface 30, boil-off gas will cool off refrigerator and pass through 30 coolings of heat of cooling interface along its whole length very effectively and shield 20.
Except shielding 20 through hot connecting 19 coolings, as shown in Figure 5, refrigerant evaporates gas can be used for directly cooling off shielding 20 to be used for the roughly the same mode of cooling refrigeration machine.Cold air can extract from helium vessel 5 through pipeline 31, pipeline 31 is preferably low heat conductivity and the pipe 32 by contacting with the shielding close thermal.An embodiment who in Fig. 5, has shown this principle.This pipe leaves the pipeline 33 through being preferably low heat conductivity from vacuum envelope 22, enter exhaust system through pipeline 34.With as hereinafter cooling off described identical mode, air-flow is controlled by using valve and throttle orifice at refrigerator.By this mode, can the balance air-flow so that the cooling performance of optimization system.
This structure will maximize the use of gas enthalpy with the cooling shielding, and can be used for being minimized in the loss of system's transportation process freezing mixture.Liquid coolant can also initially cool off required time with system from room temperature to reduce by this heat-exchange tube.
Refrigerator 1 can be any known type, for example Gifford-McMahon or pulse tube refrigerating machine.Especially the top of refrigerator can comprise accurate relatively mechanical part.Existence by as the boil-off gas stream of refrigerator provided by the present invention may be cooled to damage the risk of these parts by some parts with refrigerator far below their temperature of normal working temperature.Therefore, in certain embodiments of the invention, must take some steps to guarantee that refrigerator is not evaporated gas and is cooled to excessively cause in the scope of refrigerator infringement.
According to an aspect of the present invention, throttle orifice 13 can be arranged on the pipeline 6.This can be the throttle orifice fixed or adjustable throttle orifice.By the airflow rate in the limiter tube 6, can control mass flow rate, and therefore control the cooling effect of boil-off gas on the different parts of refrigerator through the boil-off gas of refrigerator.For example path 14,16, the 16a and 17 by hot connecting 15,30 also regulates as air-flow velocity.By suitably controlling size, can control by of the cooling of effusion boil-off gas to the different parts of refrigerator 1 by the passage of hot connecting and throttle orifice 13.Throttle orifice 13 can also carry out suitable size and limit the evaporative air of visiting neck 7 with balance through the air-flow and the process of piping 6 through the air-flow of piping 6 with restriction.For back one purpose.Can sounding pipe 6 and visit neck 7 in air-flow to guarantee the suitable cooling of refrigerator.Can also measure air-flow for other purposes, for example in order to monitor the freezing mixture quantity that remains in the coolant container.
Find that also having of throttle orifice 13 is beneficial to the convection current of the gas that avoids evaporating, otherwise boil-off gas will through sleeve pipe 2, the pipe 10 and the visit neck 7 the path in flow back in the low-temperature (low temperature) vessel, perhaps vice versa.
In an alternative, as shown in Figure 4, the low side of connecting tube 10 can extend to the top of sleeve pipe.This pipeline can be heat-insulating 10a.This embodiment's advantage is the top that boil-off gas can not flow through refrigerator, and can limit the cooling effect to the more sensing unit of refrigerator by this way.
In test, have been found that coolant loss according to low temperature magnetic system of the present invention reduce to the improved identical systems of the present invention that has no basis loss about 50%.
Although present invention is described with reference to a limited number of embodiments that only provide as example, the present invention can improve in a different manner, and this is conspicuous for the those of ordinary skill in the association area.For example, the coolant gas that is used for condensing again is installed so that do not lose the MRI magnetic system of the ultra-low temperature refrigerating device of freezing mixture when proper functioning although above-mentioned example has been described, the present invention goes for more effectively removing refrigerator by not operation and is transmitted to only carrying out freezing to shielding therein so that reduce in course of normal operation but do not eliminate the heat of the thermoscreen of the magnetic system that freezing mixture consumes.
The present invention can also be applicable to and reduce any coolant loss that is provided with the low-temperature (low temperature) vessel of the refrigerator that thermal load is provided when not operating on coolant container.
Claims (20)
1. a cryostat (3), it comprises the low-temperature (low temperature) vessel (5) that is provided with visit neck (7) and is positioned at the interior refrigerator (1) of interface sleeve pipe (2), described interface sleeve pipe is to extend into and the hot linked chamber of described coolant container from described cryostat outside, wherein: the path (4 that arrives atmosphere from the inside of described low-temperature (low temperature) vessel through described interface sleeve pipe is provided, 8,14,9,10,6), the described path so that the part of the coolant gas of overflowing from described low-temperature (low temperature) vessel is flowed through, cool off described refrigerator thus, and another part of the coolant gas of overflowing from described low-temperature (low temperature) vessel described visit neck of flowing through, described cryostat further comprises the device (13) that is used to regulate through the air-flow of described path, regulates thus by the cooling of effusion coolant gas to described refrigerator.
2. cryostat according to claim 1 is characterized in that: described path comprises the inlet (4) that arrives described coolant container; Be limited to the surface of described interface sleeve pipe (2) and the chamber (8,9) between the described refrigerator (1); And the outer pipe (10) that leads to atmosphere from described interface sleeve pipe.
3. cryostat according to claim 2 is characterized in that: described path further comprises the pipeline (6) that described outer pipe (10) is attached to described visit neck (7).
4. require any described cryostat according to aforesaid right, it is characterized in that: further comprise the vacuum envelope (22) that surrounds described low-temperature (low temperature) vessel, wherein said visit neck all crosses described vacuum envelope so that contact with external temperature with described low-temperature (low temperature) vessel with described interface sleeve pipe.
5. according to any described cryostat among the claim 1-3, it is characterized in that: further comprise the thermoscreen (20) of surrounding described low-temperature (low temperature) vessel (5), wherein said refrigerator is by described interface sleeve pipe and described thermoscreen thermo-contact, the coolant gas of overflowing from the described coolant container described path of flowing through cools off described thermoscreen thus thus.
6. according to any described cryostat among the claim 1-3, it is characterized in that: described path extends to the outlet that engages described visit neck (7) from described low-temperature (low temperature) vessel (15) through described interface sleeve pipe (2).
7. cryostat according to claim 6 is characterized in that: provide outlet valve (26) from the positive downstream of the junction point between described path and the described visit neck.
8. cryostat according to claim 5, it is characterized in that: described refrigerator is a two stage cooler, the first order of described refrigerator is by hot connecting (15,36) hot connecting is the described thermoscreen of cooling, the second level of described refrigerator is configured to cool off the inside of described low-temperature (low temperature) vessel, and passage (14,16 wherein is provided, 16a, 17) so that allow the coolant gas of overflowing from described coolant container to flow through or by described hot connecting along described path.
9. cryostat according to claim 8, it is characterized in that: described hot connecting comprises and the thermal contact (30) that contacts flange (15) and self and described shielding thermo-contact of the first order thermo-contact of described refrigerator that described contact flange and described thermal contact are by corresponding surface of contact thermo-contact and Mechanical Contact.
10. cryostat according to claim 9, it is characterized in that: described passage (14) comprises the passage in one the surface of contact being cut in described contact flange and the described thermo-contact, and described passage extends between the upper surface of one of the correspondence of described contact flange and described thermo-contact and lower surface.
11. cryostat according to claim 9 is characterized in that: described passage (17) comprises the path that passes one main body in described contact flange and the described thermo-contact.
12. cryostat according to claim 9 is characterized in that: described contact flange is a general toroidal, and described passage comprises the internal surface of cutting described contact flange and the path of upper surface.
13. according to any described cryostat among the claim 1-3, it is characterized in that: the valve (12) that in described path, is provided for closing when needed described path.
14. according to any described cryostat among the claim 1-3, it is characterized in that: described path comprises the outer pipe (10) in the top of charging into described interface sleeve pipe, and coolant gas too cools off thereby the adjacent portion that prevents described refrigerator is overflowed.
15. according to any described cryostat among the claim 1-3, it is characterized in that: further comprise from the inside of described low-temperature (low temperature) vessel (5) to the alternate path (31 of atmosphere, 32,33,34), described path and thermoscreen (20) thermo-contact of surrounding described low-temperature (low temperature) vessel, the described path so that the part of the coolant gas of overflowing from described low-temperature (low temperature) vessel is flowed through cools off described thermoscreen thus.
A 16. cryostat (3), comprise the low-temperature (low temperature) vessel (5) that is provided with thermoscreen (20), it is characterized in that: the path (31 that arrives atmosphere from the inside of described low-temperature (low temperature) vessel (5) is provided, 32,33,34), described path and thermoscreen (20) thermo-contact of surrounding described low-temperature (low temperature) vessel, the described path so that the part of the coolant gas of overflowing from described low-temperature (low temperature) vessel is flowed through, cool off described thermoscreen thus, and another part of the coolant gas of overflowing from described low-temperature (low temperature) vessel described visit neck of flowing through.
17. cryostat according to claim 15, it is characterized in that: described path with the thermoscreen thermo-contact comprises the pipeline (31) of the pipe (32) that contacts with described shielding close thermal from described coolant container guiding, described path leaves through another pipeline (33) from described vacuum envelope (22), and the thermal conductivity of wherein said pipe is greater than the thermal conductivity of arbitrary pipeline.
18. cryostat according to claim 16, it is characterized in that: described path with the thermoscreen thermo-contact comprises the pipeline (31) of the pipe (32) that contacts with described shielding close thermal from described coolant container guiding, described path leaves through another pipeline (33) from described vacuum envelope (22), and the thermal conductivity of wherein said pipe is greater than the thermal conductivity of arbitrary pipeline.
19. cryostat according to claim 16 is characterized in that: further comprise the device (13) that is used to regulate through the air-flow of described path, regulate of the cooling of effusion coolant gas thus to described thermoscreen.
20. one kind comprises the MRI system that is housed in according to the superconducting magnetic winding in any described low-temperature (low temperature) vessel of aforesaid right requirement.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0411605.9 | 2004-05-25 | ||
| GB0411605A GB0411605D0 (en) | 2004-05-25 | 2004-05-25 | Reduction of croygen loss during transportation |
| GB0423637.8 | 2004-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1989370A CN1989370A (en) | 2007-06-27 |
| CN100467934C true CN100467934C (en) | 2009-03-11 |
Family
ID=32670981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580024597 Active CN100467934C (en) | 2004-05-25 | 2005-05-12 | Reduction of cryogen loss during transportation of cryostats |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8950194B2 (en) |
| CN (1) | CN100467934C (en) |
| GB (2) | GB0411605D0 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0721572D0 (en) * | 2007-11-02 | 2007-12-12 | Siemens Magnet Technology Ltd | Cryostat for reduced cryogen consumption |
| GB2457054B (en) * | 2008-01-31 | 2010-01-06 | Siemens Magnet Technology Ltd | A method and apparatus for controlling the cooling power of a cryogenic refigerator delivered to a cryogen vessel |
| GB2458147B (en) * | 2008-03-07 | 2010-02-24 | Siemens Magnet Technology Ltd | Cryostat |
| GB2461393B (en) * | 2008-07-03 | 2012-07-11 | Bruker Biospin Gmbh | Method for cooling a cryostat configuration during transport and cryostat configuration with transport cooler unit |
| GB2467598B (en) * | 2009-02-10 | 2011-04-13 | Siemens Magnet Technology Ltd | Refrigerator isolation valve |
| WO2011138717A2 (en) * | 2010-05-04 | 2011-11-10 | Koninklijke Philips Electronics N.V. | Improved method and apparatus for shipping and storage of cryogenic devices |
| US8973378B2 (en) * | 2010-05-06 | 2015-03-10 | General Electric Company | System and method for removing heat generated by a heat sink of magnetic resonance imaging system |
| US20120306492A1 (en) * | 2011-05-31 | 2012-12-06 | General Electric Company | Penetration tube assemblies for reducing cryostat heat load |
| GB2502980B (en) * | 2012-06-12 | 2014-11-12 | Siemens Plc | Superconducting magnet apparatus with cryogen vessel |
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| CN1989370A (en) | 2007-06-27 |
| US20080155995A1 (en) | 2008-07-03 |
| GB0423637D0 (en) | 2004-11-24 |
| GB2414536A (en) | 2005-11-30 |
| US8950194B2 (en) | 2015-02-10 |
| GB2414536B (en) | 2007-06-20 |
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